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              <div class="bg">
  <div class="bg-normal"></div>
  <div class="bg-blur"></div>
</div>

<div class="container">
  <header>
    <div class="slogan-holder"></div>
    <div class="nav-holder">
    <ul class="nav">
      <li><a href="#">Home</a></li>
      <li><a href="#">About</a></li>
      <li><a href="#">Gallery</a></li>
      <li><a href="#">Contacts</a></li>
    </ul>
   </div>
  </header>

  <div class="content"></div>
</div>

            
          
!
            
              body {
	font-family:Helvetica,sans-serif;
}

.bg {
	position:fixed;
	width:100%;
	height:500px;
	z-index:-100;
}

.bg > div {
	position:absolute;
	top:0;
	left:0;
	width:100%;
	height:100%;
	background-repeat:no-repeat;
	background-size:cover;
	background-position:center center;
}

.bg-normal {
	z-index:10;
	background-image:url(http://cloud.bassta.bg/blur/bg.jpg);
}

.bg-blur {
	z-index:20;
	background-image:url(http://cloud.bassta.bg/blur/bg-blur.jpg);
	opacity:0;
}

.container {
	z-index:2000;
}

.container header {
	position:relative;
	width:100%;
	height:500px;
}

.slogan-holder {
	position:relative;
	width:100%;
	height:440px;
}

.nav-holder {
	position:relative;
	width:100%;
	height:60px;
}

ul.nav {
	width:640px;
	height:60px;
	margin:0 auto;
	border-top:1px solid #dededc;
	list-style:none;
	text-align:center;
}

ul.nav li {
	display:inline-block;
	padding-top:16px;
	padding-right:40px;
}

ul.nav li a {
	text-decoration:none;
	color:#fff;
	font-size:18px;
}

.content {
	height:2000px;
	background-color:#fff;
}

.disable-pointer-events {
	pointer-events:none!important;
}
            
          
!
            
              $(function(){
  
  /*
  http://bassta.bg/2013/12/medium-com-like-blurred-header-effect/
  */
  
  $window = $(window);
  $body  = $("body");              
  $bgBlur = $(".bg-blur");
                
  var bgBlurHeight = $bgBlur.height();
  var scrollFlag = false;
  var scrollThreshold  = 0.25; //used to debounce pointer events 
  var blurWhenReach = 3; //blur factor, 3 means the imahe will be blurred when you scroll 1/3 of the div
                
  $window.on("scroll", function(event){
	               
	  var scrollTop = $window.scrollTop(); 
	               
	  if(!scrollFlag){
		  scrollFlag = true;
	    $body.addClass("disable-pointer-events");
	  }
	               
	  debouncePointerEvents();
	               
	  if(scrollTop < bgBlurHeight){
	    var _alpha = (scrollTop / bgBlurHeight) * blurWhenReach;
	    if(_alpha > 1){ _alpha = 1 }
		  TweenMax.set($bgBlur, {alpha: _alpha });
	  }
	               
   });
	
   // Speed up things by disabling pointer events. I use TweenMax delayedCall instead JS native setInterval just for the sake of showing how to use this method. See more at https://www.thecssninja.com/javascript/pointer-events-60fps
				
  function debouncePointerEvents(){
	  TweenMax.killDelayedCallsTo(addPointerEvents);
		TweenMax.delayedCall(scrollThreshold, addPointerEvents);
  }
				
  function addPointerEvents(){
	  scrollFlag = false;
		$body.removeClass("disable-pointer-events");
  }
				
});
            
          
!
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